When edge dislocations on a close-packed plane in a grain cannot slip in an adjacent grain with differently oriented close-packed planes, dislocations form a(n) _________ at a grain boundary.
Fill in the blank(s) with the appropriate word(s).
pile-up
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Briefly explain why we think white-dwarf supernovae are useful for measuring cosmic distances
What will be an ideal response?
Why couldn't Newton determine the value of the gravitational constant?
a. The constant was too large to measure with existing instruments. b. The constant was too small to measure with existing instruments. c. If the gravitational constant were known, the mass of Earth could be calculated. d. Although Newton believed there was a constant, no one has ever discovered one. e. Although the right equipment and techniques for this measurement existed, Newton did not have access to them.
Planetary orbits
A) are evenly spaced throughout the solar system. B) are highly inclined to the ecliptic. C) are almost circular, with low eccentricities. D) have the Sun at their exact center. E) are spaced more closely together as they get further from the Sun.
A negative charge, if free, tries to move
A) from high potential to low potential. B) from low potential to high potential. C) toward infinity. D) away from infinity. E) in the direction of the electric field.